1. Answer following 1 questions on the application of a design pattern. a. (5 points) You are designing a Car Racing video game such as Need for Speed or Forza Motor Sport. In your game, a user is given a car with a default configuration. However, as a user wins races and earns credits, he/she can buy optional customizations (e.g., Custom Transmission, Custom Wheel, and PremiumEngine Oil) to improve the performance of his/he car. Which design pattern would be most appropriate to design the class hierarchy for base car model and its customizations and why? b. (10 points) Draw an UML diagram of the design.